request-pull: short sha handling, manual update

request-pull prints incorrectly warn messages about not found commits and man pages don't say anything about todays changed behaviour. People are confused and try look for errors at wrong places. At least these should be fixed/modified.

Warn massage says that commit can't be found ar remote, however there it is in and is missing on local repository in 'many' cases. So I don't know if better solution is check, where commit is truly missing or transform warning message. Something like:

warn: No match for commit <commit> found at <url> or local repository.
warn: Are you sure you have synchronized branch with remote
repository?

......
man page could be changed like this:

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Documentation/git-request-pull.txt +4 -0

index 283577b..6d34fc7 100644
@@ -73,6 +73,17 @@ then you can ask that to be pulled with
        git request-pull v1.0 https://git.ko.xz/project master:for-linus
 
 
+NOTES
+-----
+
+Since git version 2.0.0 is behaviour of git request-pull little 

different.

Documentation/git-request-pull.txt +7 -1

+It is recommended use of third argument for each request-pull, otherwise
+you can get error message like:
+
+   warn: No match for commit <commit> found at <url>
+   warn: Are you sure you pushed 'HEAD' there?
+
+
 GIT
 ---
 Part of the linkgit:git[1] suite
 
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Second patch provides right processing of third parameter when short version of sha hash is used (e.g. 897a111). Now is supported only full hash, what is different behaviour against first parameter or what can be found in other functions. Extra solves one of cases of wrong warn message.

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git-request-pull.sh +5 -1

index d5500fd..2dc735e 100755
@@ -92,9 +92,11 @@ find_matching_ref='
                chomp;
                my ($sha1, $ref, $deref) = /^(\S+)\s+([^^]+)(\S*)$/;
                my ($pattern);
+               my ($pattern2);
                next unless ($sha1 eq $headrev);
 
                $pattern="/$head\$";
+               $pattern2="^$head";
                if ($ref eq $head) {
                        $found = $ref;
                }

@@ -104,6 +106,9 @@ find_matching_ref='
                if ($sha1 eq $head) {
                        $found = $sha1;
                }
+               elsif ($sha1 =~ /$pattern2/ and (length $head) gt 7) {
+                       $found = $sha1
+               }
        }
        if ($found) {
                print "$found\n";
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